Animal and Vegetable Physiology. 2 Volume Paperback Set: - download pdf or read online

By Peter Mark Roget

ISBN-10: 110800007X

ISBN-13: 9781108000079

Less than the phrases of the desire of the Oxford pupil Francis Henry, Earl of Bridgewater (1756-1829), Fellow of the Royal Society, absentee rector and prepared manuscript-collector, a sequence of books used to be commissioned, designed to give a contribution to an knowing of the realm as created by way of God. In 1834 Peter Roget, who used to be on the time compiling his celebrated glossary, contributed a two-volume treatise to that debatable sequence, which shaped a part of the complicated highbrow history to Darwin's paintings on evolution. Roget defined, in a way designed to attract a large viewers, the diversity and complexity of the plant and animal kingdoms, focussing on mechanics within the first quantity and body structure within the moment. The interconnected capabilities of person crops and animals are visible as proving God's layout. The arguments discovered right here resonate with debates that proceed this day, in addition to supplying resource fabric for historians of technology.

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Additional info for Animal and Vegetable Physiology. 2 Volume Paperback Set: Animal and Vegetable Physiology: Considered with Reference to Natural Theology

Sample text

Several tribes of plants contain liquids that are opaque, and of a white milky appearance; this is the case with the Poppy, the Fig-tree, the Convolvulus, and a multitude of other genera; and a similar kind of juice, but of a yellow colour, is met with in the Chelidonium, or Celandine. All these juices are of a resinous nature, and usually highly acrid, and even poisonous in their qualities; and their opacity is occasioned CIRCULATION IN PLANTS. 49 by the presence of a great number of minute globules, visible with the microscope.

Return of the Sap. THE sap, which, during its ascent from the roots, contains but a small proportion of nutritious particles, diluted Avith a large quantity of water, after undergoing in the leaves, as in a chemical laboratory, the double processes of exhalation and aeration, has become much more highly charged with nutriment; and that nutriment has been reduced to those particular forms and states of composition which render it applicable to the growth of the organs, and the other purposes of vegetable life.

Starch, and lignin, on the other hand, are compounds of a more permanent character, and especially adapted for being retained in the organs. Starch which, though solid, still possesses considerable solubility, is peculiarly fitted for being applied to the purposes of nourishment : it is accordingly hoarded in magazines, with a view to future employment, being to vegetables, what the fat is to animals, a resource for the exigencies that may subsequently arise. With this intention, it is carefully stored in small cells, the coats of which protect it from the immediate dissolving action of the surrounding watery sap, but allow of the penetration of this fluid, and of its solution, when the demands of the system require it.

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Animal and Vegetable Physiology. 2 Volume Paperback Set: Animal and Vegetable Physiology: Considered with Reference to Natural Theology by Peter Mark Roget


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